Wideband RCS reduction using a composite impedance surface
|關鍵字:||複合式阻抗表面;減小雷達截面積;composite impedance;RCS reduction|
Stealth technology has attracted considerable attentions in military for many years because of the application of radar system in ranging and detection for a moving object such as aircraft and ships. Radar Cross Section (RCS) reduction is an efficient way for stealth by minimizing the reflection of electromagnetic wave towards the incident direction. In this thesis, we investigate the wideband RCS reduction of a planar surface made up of a composite artificial magnetic conductor (AMC). Such a composite AMC consists of two types of unit cell pattern with 180-degree phase shift between them. By interleaving the two patterns and arranging them on a chessboard pattern, for a plane wave normally incident on this surface the reflecting wave will have a null field along the impinging direction. The commercial software based on the finite integration method (CST-Microwave Studio) is used for characterizing the reflection property of the AMC surface and scattering characteristics of the overall structure. Additionally, we have fabricated the structure and measured its scattering response including the bi-static and mono-static. Significantly, a wideband RCS reduction ranging from 16 GHz to 25 GHz is obtained. Since this planar structure can be fabricated using standard printed circuit board technology without via-hole process, it should have potential application in stealth technology.
|Appears in Collections:||Thesis|
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